An interpopulation study of the essential oils of Cistus parviflorus L. growing in Crete (Greece)

The composition of the essential oils of nine populations of Cistus parviflorus L., from Crete (Greece) and their interpopulation variability, were investigated by GC-MS. 114 compounds were identified representing an average of 85-96% of oil composition. Labdane diterpenes were detected and identified in the essential oils of Cistus parviflorus L. for the first time. The results obtained from GC-MS analysis of the volatile oils were submitted to principal component and chemometric cluster analysis. Two main chemotypes (clusters) were differentiated; the first of West Crete and the second of East Crete. Carvacrol, caryophyllene oxide, α-epi-cadinol, abietatriene, 4-epi-dehydroabietol, dehydro abietol, cis-ferruginol and manoyl oxide mixture of isomers are the main constituents, while oxygenated sesquiterpenes as well as diterpenes have been found in high percentage composition. © 2001 Elsevier Science Ltd

Diurnal and seasonal variation of the essential oil labdanes and clerodanes from Cistus monspeliensis L. leaves

The composition of the essential oil from the leaves of Cistus monspeliensis (Cistacea) shows seasonal and diurnal variation. The essential oils were investigated by GC-FID and GC-MS. Labdanes which were identified for the first time in the essential oil of C. monspeliensis, are predominant in autumn and in winter and they were found in great amount with clerodanes in spring. Manoyl oxide, 3β-hydroxy-13-epi-manoyl oxide, 3β-acetoxy-13-epimanoyl oxide and their isomers varied through the day and the year. The results obtained fro GC-MS analysis of the oils were submitted to statistical analysis. © 2002 Elsevier Science Ltd. All rights reserved

Diurnal and seasonal variation of the essential oil labdanes and clerodanes from Cistus monspeliensis L. leaves

The composition of the essential oil from the leaves of Cistus monspeliensis (Cistacea) shows seasonal and diurnal variation. The essential oils were investigated by GC-FID and GC-MS. Labdanes which were identified for the first time in the essential oil of C. monspeliensis, are predominant in autumn and in winter and they were found in great amount with clerodanes in spring. Manoyl oxide, 3β-hydroxy-13-epi-manoyl oxide, 3β-acetoxy-13-epimanoyl oxide and their isomers varied through the day and the year. The results obtained fro GC-MS analysis of the oils were submitted to statistical analysis. © 2002 Elsevier Science Ltd. All rights reserved

An interpopulation study of the essential oils of Cistus parviflorus L. growing in Crete (Greece)

The composition of the essential oils of nine populations of Cistus parviflorus L., from Crete (Greece) and their interpopulation variability, were investigated by GC-MS. 114 compounds were identified representing an average of 85-96% of oil composition. Labdane diterpenes were detected and identified in the essential oils of Cistus parviflorus L. for the first time. The results obtained from GC-MS analysis of the volatile oils were submitted to principal component and chemometric cluster analysis. Two main chemotypes (clusters) were differentiated; the first of West Crete and the second of East Crete. Carvacrol, caryophyllene oxide, α-epi-cadinol, abietatriene, 4-epi-dehydroabietol, dehydro abietol, cis-ferruginol and manoyl oxide mixture of isomers are the main constituents, while oxygenated sesquiterpenes as well as diterpenes have been found in high percentage composition. © 2001 Elsevier Science Ltd

A comparative study of the essential oils of Cistus salviifolius in several populations of Crete (Greece)

The composition of the essential oils of fifteen populations of Cistus salviifolius L. (Cistaceae) from Crete (Greece) and their interpopulation variability was investigated by GCMS. 167 compounds were identified representing an average of 96-100% of the oil composition. Labdane diterpenes were detected and identified in the essential oils of Cistus salviifolius L., for the first time. The results obtained from GC-MS analysis of the oils were submitted to a Principal Component Analysis (PCA). Three main chemotypes (clusters) were differentiated. All the essential oils were tested for their antimicrobial activity against Gram-positive and Gram-negative bacteria. Only chemotype III having camphor as a major constituent was active against Gram-positive bacteria. Camphor, viridiflorol, longiborneol, phyllocladene, abietatriene and cis-feruginol are the main constituents, while the group of oxygenated sesquiterpenes has the highest percentage composition. © 2002 Elsevier Science Ltd. All rights reserved

Chemical composition and antimicrobial activities of helichrysum amorginum cultivated in Greece

The chemical composition of the essential oil obtained from the aerial parts of the cultivated Helichrysum amorginum was investigated by GC and GC/MS. From the 29 identified constituents representing 85.0% of the total oil, spathulenol (36.6%) and β-pinene (12.5%) were the major components. Furthermore, it was found that the oil exhibited a moderate antimicrobial activity against four Gram-negative bacteria, two Gram-positive and three pathogenic fungi. © 2004, Taylor & Francis Group, LLC. All rights reserved

A chemometric interpopulation study of the essential oils of Cistus creticus L. Growing in Crete (Greece)

The chemical composition of the essential oils of twenty-five populations of Cistus creticus subsp. creticus L. from the island of Crete (Greece) and their interpopulation variability were analysed in detail by GC-MS. 142 compounds were identified representing an average of 56.8-89.8% of the oil composition. The components are represented here by homologous series of monoterpenes, oxygenated monoterpenes, sesquiterpenes, oxygenated sesquiterpenes, diterpenes, labdane diterpenes, aldehydes, alkanes, esters, fatty acids, ketones, and others. Labdane diterpenes were detected and identified in the essential oils and have been found in high percentage composition. The results from the chemical analysis of the essential oils were submitted to chemometric cluster analysis in order to detect some pattern distribution and to identify which constituents can differentiate the groups of individuals. Two main chemotypes (clusters) were well differentiated; the first deals with eight populations of West Crete and the second with the rest of the populations. Cluster analysis based on labdane type diterpenes patterns, proved to be the best chemotype for the examined populations among the other chemical groups